<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>函数参数默认值</title>
</head>
<body>
  <script>
    // ES6 允许给函数参数赋值初始值
    //1. 形参初始值 具有默认值的参数，一般位置要靠后（潜规则）
    function add(a,b,c = 10){
      return a+b+c;
    }
    let result = add(1,2)
    console.log(result);

    //2.与解构赋值结合
    function connect({host="127.0.0.1",username,password,port}){
      console.log(host);
      console.log(username);
      console.log(username);
      console.log(port);
    }
    connect ({
      host:"atguigu.com",
      username:'root',
      username:'root',
      port:3306
    })
  </script>
</body>
</html>